I have two of them & in their defence, whilst they are 'only' a moulded IEC on a 0.75mm cable, the moulded plug is high quality & noticeably better than the run of the mill kettle lead stuff, the best I've seen TBH. The Naim 13a plug is an all plastic copy of the original PowerLine & only able to take 0.75mm cable (missed a trick there Naim, might sell a whole load more if it was able to fit chunky cable & was sold separately).
How do they sound ?? I used them to replace some good quality Supra LoRad, Martin Kaiser, MK ToughPlug cables on my Teddy PSU's, I don't detect any difference.